I need help solving and explanation im completely lost please help me :(

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m